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SCIENCE CHINA Information Sciences, Volume 63 , Issue 1 : 112204(2020) https://doi.org/10.1007/s11432-019-9896-2

Dual-mode predictive control of a rotor suspension system

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  • ReceivedFeb 21, 2019
  • AcceptedApr 29, 2019
  • PublishedDec 25, 2019

Abstract

Rotor active magnetic bearing (rotor-AMB) systems are frequently used to alleviate vibrations for various applications such as in national defense, manufacturing industries, IC production, and aerospace engineering.One obstacle to improve machining efficiency and quality is the open-loop instability of rotor-AMB systems during the machining process. We built a closed-loop processing platform using aspindle rotor installed with AMBs and thereby developed a rotor-AMB suspension system embedded with a dual-mode predictive controller (DMPC).The performance of the system is thus substantially improved. In the proposed DMPC, both model-based prediction and receding horizon optimization are utilized to guarantee the closed-loop stability of the rotor-AMB suspension systems with input constraints. Finally, the effectiveness and superiority of the proposed method are examined through substantial levitation experiments on a machining platform with installed AMBs.


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  • Figure 1

    (Color online) (a) Spindle with AMBs. (b) Structure of the spindle with installed AMBs. ${b}_1$: front bearing; protect łinebreak ${b}_2$: back bearing; ${b}_3$: front position sensors; ${b}_4$: back position sensors; $c$: axial bearing; $d$: motor. (c) Magnified image of the rotor.

  • Figure 2

    (Color online) Architecture of the control system of the rotor-AMB platform displayed in Figure 1. $a_1$: monitor; $a_2$: controller; $a_3$ and ${a}_4$: power amplifiers; ${a}_5$: displacement amplifiers and filters.

  • Table 1   Parameters for two axial AMBs in the spindle
    Data Value Units
    AMB mass $M_{f,b}$ diag(8,8), diag(6,6) kg
    Coil turns $N_{f,b}$ 180, 180
    Pole area $\zeta_{f,b}$ 850, 612 $\text{mm}^2$
    Nominal gap length $q_0$ 0.50 mm
    Backup bearing gap $R_0$ 0.25 mm
    Bias current $I_0$ 0.5 A

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